<template>
	<view v-if="goods_info.goods_name" class="goods-detail-cantainer">
    <!-- 轮播图区域 -->
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000">
      <swiper-item v-for="(item, i) in goods_info.pics" :key='i'>
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>
    
    <!-- 商品信息区域 -->
    <view class="goods-info-box">
      <!-- 商品价格 -->
      <view class="price">
        ￥{{goods_info.goods_price}}
      </view>
      <!-- 信息主体区域 -->
      <view class="goods-info-body">
        <!-- 商品名称 -->
        <view class="goods-name">
          {{goods_info.goods_name}}
        </view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type='star' size='18' color='gray'></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">快递：免运费</view>
    </view>
    
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>
    
    <!-- 商品导航组件 -->
    <view class="goods-nav">
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick" @buttonClick="buttonClick"></uni-goods-nav>
   </view>
	</view>
</template>

<script>
  import { mapState, mapMutations, mapGetters } from 'vuex'
	export default {
    computed:{
      ...mapState('m_cart',['cart']),
      ...mapGetters('m_cart',['total'])
    },
    watch: {
      // total(newVal){
      //   const findResult = this.options.find(x => x.text === '购物车')
      //   console.log(findResult);
      //   if(findResult){
      //     findResult.info = newVal
      //   }
      // }
      total: {
        // handler 属性用来定义侦听器的 function 处理函数
        handler(newVal){
          const findResult = this.options.find(x => x.text === '购物车')
          if(findResult){
            findResult.info = newVal
          }
        },
        // immediate 属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
        immediate: true
      }
    },
		data() {
			return {
        // 商品详情对象
				goods_info: {},
        // 左侧按钮组的配置对象
        options: [{
          icon: 'shop',
          text: '店铺'
        },
        {
          icon: 'cart',
          text: '购物车',
          info: 0
        }],
        // 右侧按钮组的配置对象
        buttonGroup: [{
          text: '加入购物车',
          backgroundColor: '#ff0000',
          color: '#fff'
        },
        {
          text: '立即购买',
          backgroundColor: '#ffa200',
          color: '#fff'
        }]
			}
		},
    methods:{
      ...mapMutations('m_cart',['addToCart']),
      // 获取商品详情
      async getGoodsDetail(goods_id){
        const {data:res} =  await uni.$http.get('/api/public/v1/goods/detail',{goods_id})
        
        if (res.meta.status !== 200) return uni.$showMsg()
        
        // 取消图片间隙，使用正则把 <img  替换为 <img style="display:block" ,改进图片无法正常显示的问题
        
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display:block;" ').replace(/webp/g, 'jpg')
        
        this.goods_info = res.message
      },
      // 图片预览
      preview(i){
        // 调用 uni.previewTmage() 方法预览图片
        uni.previewImage({
          // 预览时默认显示图片的索引
          current:i,
          // 所有图片 url 的数组
          urls:this.goods_info.pics.map(x => x.pics_big)
        })
      },
      onClick(e){
        if (e.content.text === '购物车') {
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      buttonClick(e) {
        if (e.content.text === '加入购物车') {
          // 创建一个商品信息对象
          const goods = { 
            goods_id: this.goods_info.goods_id, 
            goods_name: this.goods_info.goods_name, 
            goods_price: this.goods_info.goods_price, 
            goods_count: 1, 
            goods_small_logo: this.goods_info.goods_small_logo, 
            goods_state: true 
          }
          
          // 通过 this 调用映射过来的 addToCart 方法, 把商品信息对象存储到购物车中
          this.addToCart(goods)
        }
      }
    },
    onLoad(options) {
      const goods_id = options.goods_id
      this.getGoodsDetail(goods_id)
    }
	}
</script>

<style lang="scss">
swiper {
  height: 750rpx;
  
  image {
    height: 100%;
    width: 100%;
  }
}
.goods-info-box {
  padding: 10px;
  padding-right: 0px;
  
  .price {
    color: #c00000;
    font-size: 18px;
    margin: 10px 0;
  }
  
  .goods-info-body {
    display: flex;
    justify-content: space-between;
    
    .goods-name {
      font-size: 13px;
      margin-right: 10px;
    }
    .favi {
      width: 120px;
      font-size: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      border-left: 1px solid #efefef;
    }
  }
  .yf {
    font-size: 12px;
    color: gray;
    margin: 10px 0;
  }
}

.goods-detail-cantainer {
  padding-bottom: 50px;
}

.goods-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
}
</style>
